7.How did ancient people tell time?
◆Natural ways of keeping time
In ancient time,people had to use the sun and the moon to tell time.They got up when the sun came up and worked in the fields until the sun went down.
◆Man-made things
The sand clock is made of two glass balls joined by a narrow neck.The top ball was filled with sand.The sand slowly moved through the neck into the bottom(底部) ball.People knew the time by watching how much sand fell to the bottom ball.People also made the water clock.They made a small hole near the bottom of a pot.When the water in the pot dripped(滴) out,marking(刻度) inside the pot showed how much time passed.
◆Body clocks in living things
Animals'body clock
Animals don't need clocks to know time.They have their body clocks.Birds know when to fly to warmer places before winter.Some animals know when to keep more food for the winter.Some fish know when it's time to move up the river and lay eggs.
Plants'own clock
Plants have their own clocks to keep time.Plants know when to open flowers or when to drop their leaves.
Body clock in human beings
People also have their own body clocks.When we get used to our lives,our body clocks can be very exact.It can tell us when it's time to wake up.It can also tell us when to eat or to go to sleep.
74.How could an ancient farmer know when to go back home from the field in the daytime?C
A.By looking at the moon
B.By the sand clock or the water clock
C.By looking at the sun
D.By feeling whether tired or not
75.According to the passage,how can animals know time?A
A.They use body clocks
B.They ask other animals
C.They use the sun and the moon
D.They make something to tell time
76.How many kinds of living things with body clocks are mentioned(提到) here?B
A.Two
B.Three
C.Four
D.Six
77.In what way is the sand clock the same as the water clock in telling time?D
A.Both of them have a neck
B.Both of them have two glass balls
C.Both of them can be used only once
D.Both of them give the time by quantity(数量)
78.The passage is mainly aboutC.
A.man-made clocks
B.nature's clocks
C.time and clock
D.how people keep time.
分析 短文讲了确定时间的一些方法,具体的介绍了它们的原理等.
解答 答案:74.C 细节理解题.根据第三行句子In ancient time,people had to use the sun and the moon to tell time.They got up when the sun came up and worked in the fields until the sun went down.在古代,人们不得不利用太阳和月亮来报时,他们在太阳升起的时候起床,在地里干活,直到太阳下山.可知是通过看太阳.故选C.
75.A 细节理解题.根据倒数第六行句子Animals don't need clocks to know time.They have their body clocks.动物不需要时钟来了解时间.它们有自己的生物钟.可知他们通过生物钟.故选A.
76.B 细节归纳题.根据整篇文章内容及其句子Animals'body clock,动物的生物钟.Plants'own clock植物自身的时钟.Body clock in human beings.人的生物钟.可知有三种.故选B.
77.D 细节理解题.根据第六行句子People knew the time by watching how much sand fell to the bottom ball.人们通过观察沙子落在底部球上的数量来确定时间.When the water in the pot dripped(滴) out,marking(刻度) inside the pot showed how much time passed.当壶里的水滴出来时,罐子里的痕迹显示出多少时间过去了.可知它们都是按数量来确定时间的.故选D.
78.C 主旨归纳题.根据整篇文章内容及其句子How did ancient people tell time?古代人们是怎么确定时间的?和Natural ways of keeping time.自然保持时间的方法.Man-made things.人造物品.Body clocks in living things..生物中的生物钟.可知文章主要说的是时间和时钟.故选C.
点评 在通读全文的基础上,根据全文大意,展开逻辑思维,瞻前顾后,认真观察选项,仔细推敲,确定最佳答案.